Transient Synovitis of the Hip

Transient synovitis of the hip, also known as toxic synovitis or transient hip synovitis, is a self-limiting inflammatory condition that affects the synovial membrane of the hip joint.

Causes and Risk Factors

The exact cause of transient synovitis of the hip is unknown, but it is thought to be related to a viral infection or an allergic reaction. It is more common in children between the ages of 3 and 10 years old, with a peak incidence around 5-6 years old. Boys are affected more often than girls.

Symptoms

The symptoms of transient synovitis of the hip may include:

• Pain in the hip, thigh, or knee
• Limping or refusal to bear weight on the affected leg
• Swelling and warmth around the hip joint
• Reduced range of motion in the hip joint
• Fever (in some cases)

Diagnosis

The diagnosis of transient synovitis of the hip is based on a combination of clinical evaluation, laboratory tests, and imaging studies. The following tests may be used to diagnose transient synovitis:

• Complete blood count (CBC) to rule out infection or inflammation
• Erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) to evaluate for inflammation
• X-rays of the hip joint to rule out other conditions such as fractures or osteomyelitis
• Ultrasound or magnetic resonance imaging (MRI) to evaluate the synovial membrane and joint fluid

Treatment

The treatment for transient synovitis of the hip is typically conservative and supportive, with the goal of reducing pain and inflammation. The following treatments may be used:

• Rest and avoidance of weight-bearing activities
• Pain management with over-the-counter medications such as acetaminophen or ibuprofen
• Physical therapy to maintain range of motion and strength in the affected leg

Prognosis

The prognosis for transient synovitis of the hip is generally excellent, with most children recovering fully within a few weeks. In some cases, the condition may recur, but this is rare.

Differential Diagnosis

Transient synovitis of the hip must be differentiated from other conditions that can cause similar symptoms, such as:

• Septic arthritis
• Osteomyelitis
• Fractures or trauma
• Juvenile idiopathic arthritis

A thorough evaluation and diagnostic workup are necessary to rule out these conditions and confirm the diagnosis of transient synovitis of the hip.

Frequently Asked Questions (FAQs)

What is transient synovitis of the hip?
Inflammation of the hip joint lining.

What are the symptoms of transient synovitis of the hip?
Pain, limping, and limited mobility.

What causes transient synovitis of the hip?
Unknown, possibly viral or traumatic.

How common is transient synovitis of the hip?
Most common hip condition in children.

What age group is typically affected by transient synovitis of the hip?
Children under 10 years old.

Is transient synovitis of the hip contagious?
No, it is not contagious.

How is transient synovitis of the hip diagnosed?
Physical exam, imaging tests, and lab tests.

What are the treatment options for transient synovitis of the hip?
Rest, pain relief, and physical therapy.

Can transient synovitis of the hip lead to other conditions?
Rarely, it may be associated with Perthes disease or slipped capital femoral epiphysis.

What is the prognosis for transient synovitis of the hip?
Usually resolves on its own within 1-3 weeks.